Abstract
Dual-comb spectroscopy (DCS) [1] uses asynchronous broadband coherent sources to achieve Fourier-transform-like spectroscopy but with no moving parts and near-kHz acquisition rates [2]. Here we demonstrate dual-comb mid-infrared spectroscopy of methane gas using two free-running optical parametric oscillators (OPOs) with a repetition-rate difference of 500 Hz and complete optical calibration from a microwave reference.
© 2017 IEEE
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